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Fumes from 289 Oil Filler Cap

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    Fumes from 289 Oil Filler Cap

    I'm sure this is a hardy annual but would appreciate some diagnostic advice please guys.......getting quite a few whisps of vapour/grey smoke from the valve cover oil filler cap on the right bank of cylinders. No misfire, not using very much engine oil, no sign of coolant loss. Running Carter 4 barrel 750cfm carb on Edelbrock Performer on standard 289 (as far as I know) A few months ago a mechanic found a bent rocker arm on that bank of cylinders and replaced it.......is it a valve problem ? Would appreciate suggestions of what can I check initially without stripping things down too much pls guys. Thanks

    #2
    I'd have a quick check you don't have any blockage in the recirculation lines from the cover to the air cleaner. The one way valve, should flow freely one way and leave you sucking the other.

    As for the smoke itself, its common to have some whisps. If you oil condition is good and not milky then you don't need to worry about water entering the oil causing steam rather than smoke. Any smoke will usually be more from piston ring blowby then valve guide wear but you can compression test the engine if you suspect something amiss there. But, its easier to start off with checking out the hoses and valves running from the valve covers.

    Comment


      #3
      As rider says these engines are designed to run a PCV (positive crankcase ventilation) system. The idea of this system is that it keeps the engine crankcase below atmospheric pressure by using some of the manifold vacuum. This should prevent fumes coming out of the engine and also to some degree oil escape from crank seals etc. There should be a PCV valve in the other rocker box opposite the filler and it should have a hose that goes to the large inlet on the front of the Edelbrock carb. If its not there you need to fit one and the valves and hose are readily available and not expensive. If you do have this fitted pull it off and check that the pipe is clear and that the little piston thing in the valve moves freely against a spring. Alternatively get a new PCV valve as they can gum up over time and cost very little. Also check that the PCV valve is a good press fit in the grommet in the rocker box. Mine was quite slack as the grommet had gone hard but I put some plumbers tape around the valve so its held firm now.
      Allan

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        #4
        Thanks very much to you both - I think you've probably nailed it. I have Edelbrock chrome valve covers each with an oil filler cap and there is no PCV arrangement whatever. Just to clarify please: Viewed from the driver's seat should I fit a PCV to the right hand valve cover (with the oil filler nearest the firewall) or to the left hand valve cover with the oil filler nearest the radiator ?

        Comment


          #5
          Sitting in the drivers seat the oil filler cap should be on the drivers side rocker box near to the radiator. The PCV is on the passenger side toward the firewall. I am pretty sure that the Edelbrock valve covers are an identical pair so that the passenger side is the same as the drivers side but turned around end to end. If this is the case here is what you need.
          https://www.ebay.co.uk/p/Engine-Cran...hoCvrsQAvD_BwE

          This may be a better link
          https://www.summitracing.com/parts/edl-4407/
          Last edited by ALLAN R; 11-11-2019, 06:38 PM.
          Allan

          Comment


            #6
            Originally posted by ALLAN R View Post
            Sitting in the drivers seat the oil filler cap should be on the drivers side rocker box near to the radiator. The PCV is on the passenger side toward the firewall. I am pretty sure that the Edelbrock valve covers are an identical pair so that the passenger side is the same as the drivers side but turned around end to end. If this is the case here is what you need.
            https://www.ebay.co.uk/p/Engine-Cran...hoCvrsQAvD_BwE

            This may be a better link
            https://www.summitracing.com/parts/edl-4407/
            Yes those are the valve covers I have - many thanks Allan. Just ordered one from John Woolfe Racing that I found on Ebay

            Comment


              #7
              Originally posted by ALLAN R View Post
              Sitting in the drivers seat the oil filler cap should be on the drivers side rocker box near to the radiator. The PCV is on the passenger side toward the firewall. I am pretty sure that the Edelbrock valve covers are an identical pair so that the passenger side is the same as the drivers side but turned around end to end. If this is the case here is what you need.
              https://www.ebay.co.uk/p/Engine-Cran...hoCvrsQAvD_BwE

              This may be a better link
              https://www.summitracing.com/parts/edl-4407/
              In my ignorance, just to double-check..... I now have the edelbrock cap with 90 degree nipple. Do I need an in-line PCV as well or do I simply attach a pipe from the elbrock cap to the front of the carb? Many thanks again

              Comment


                #8
                The Edelbrock cap should be the PCV so no need for an inline PCV. Just get a bit of hose from any decent motor factors and connect it to the carb.
                Allan

                Comment


                  #9
                  Originally posted by ALLAN R View Post
                  The Edelbrock cap should be the PCV so no need for an inline PCV. Just get a bit of hose from any decent motor factors and connect it to the carb.
                  Thanks very much again Allan - will post again when I've had chance to fit the cap

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